Configure port speed on 3550 Gi ports

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Feb 16th, 2008
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How do you set the Gi port speed and duplex on a 3550. I'm taking it the default for the Gi port is full being Gi but I cant set the speed unless I set it on the other device connecting to the port.

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Edison Ortiz Sat, 02/16/2008 - 08:29
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You should let the port negotiate the Gigabit speed. Setting the speed to a Gig on the connected device, will produce a speed/duplex mismatch. Not an optimal configuration.

If you have an end device which is Gigabit capable while connected to a Gigabit port in the 3550, it will autonegotiate to 1Gb/FD.




jpsenior_bell Sat, 02/16/2008 - 13:23
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Additionally, gigabitEthernet spec always calls for auto-negotiation. Many gigabit implementations will fail (Sun gear being a usual culprit) when you try to set to 1000/full. Keep it to auto and things will work out to the best of their ability.


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